Think of it like this....Would you like to eat macdonalds fries every day for the rest of your life???? Probably not...And also you would probably end up dead after a few weeks anyway even if you did love eating macdonalds fries day in day out...

Fish like humans require nitrition in various forms to stay healthy....

On a side note New Life Spectrum foods are amazing as a staple! But not exclusively!

There are some high quality foods with a nutritional balance meant to meet all of the needs of your fish. These are often species specific and should still be supplemented with other foods if at all possible.

There are some commercial breeders using nothing but the same feed for years on end. Many of them supply aquarium shops around the world. When money is the main object this sort of thing becomes common.

Another thing to keep in mind is the level (top, mid, bottom) that the fish live and eat. While all foods will sink, some will sink faster than others. For top feeders you need food that sits on the surface for a little while, for mid you should get food that sinks slowly, and for bottom, either you can let them eat the excess that falls or give them fast dropping food just for them.

Fish physiology generally determines 'how' fish will mostly feed. Up-turned mouths will go for surface feeding, even mouths will go for mid-tank, and down-turned mouths will go for the bottom. But, keep in mind that this is only their preferred method of feeding. When hungry bottom feeders will expend the energy to feed upside down on the surface, level-mouth and up-turned mouth fish will feed on the bottom. Don't make your fish expend unnecessary energy if they don't need and you can provide varied foods for all your type fish

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When one can't explain things simply, they just don't really understand it.

Fish feeders - I think the only practical situation in which you cannot personally feed your fish would be vacations, family emegencies, etc.. Hey, it is a hobby. May as well get your hands into the thick